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This new 40TB hard drive from Seagate is just the beginning—50TB is coming fast!
(www.techradar.com)
This is a most excellent place for technology news and articles.
My main data usage is game installs and pretty unimportant temporary stuff so it doesn't need backup fortunately. Game saves do of course but a simple bash script and the file size for that is tiny in comparison.
SSD performance would be nice to have, but costs extra.
SSDs are getting reasonable, you might want to look into it again if that's your use case.